package com.jelly.concurrency.syn;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantLock;

public class AttemptLocking {
	private ReentrantLock lock = new ReentrantLock();

	public void untimed() {
		boolean captured = lock.tryLock();
		try {
			System.out.println("tryLock(): " + captured);
		} finally {
			if (captured) {
				lock.unlock();
			}
		}
	}
	
	public void timed(){
		boolean captured = false;
		try {
			captured = lock.tryLock(2,TimeUnit.SECONDS);
		} catch (InterruptedException e) {
			throw new RuntimeException();
		}
		
		try {
			System.out.println("tryLock(2,TimeUnit.SECONDS):"+captured);
		} finally{
			if(captured){
				lock.unlock();
			}
		}
	}
	public static void main(String[] args) {
		final AttemptLocking al = new AttemptLocking();
		al.untimed(); //Ture -- lock is available
		al.timed(); //True -- lock is available
		new Thread(){
			{
				setDaemon(true);
			}
			@Override
			public void run() {
				al.lock.lock();
				System.out.println("acquired");
			}
		}.start();
		Thread.yield(); //Give the 2nd task a chance
		al.untimed();  // False-- lock grabbed by task
		al.timed();
	}
}
